The brand manager for a brand of toothpaste must plan a campaign designed to increase brand recognition. He wants to first determine the percentage of adults who have heard of the brand. How many adults must he survey in order to be 95% confident that his estimate is within seven percentage points of the true population percentage? Complete parts (a) through (c) below. a) Assume that nothing is known about the percentage of adults who have heard of the brand. n = 196 (Round up to the nearest integer.) b) Assume that a recent survey suggests that about 86% of adults have heard of the brand. n = 96 (Round up to the nearest integer.) c) Given that the required sample size is relatively small, could he simply survey the adults at the nearest college? OA. No, a sample of students at the nearest college is a convenience sample, not a simple random sample, so it is very possible that the results would not be representative of the population of adults. OB. No, a sample of students at the nearest college is a cluster sample, not a simple random sample, so it is very possible that the results would not be representative of the population of adults. OC. No, a sample of students at the nearest college is a stratified sample, not a simple random sample, so it is very possible that the results would not be representative of the population of adults. OD. Yes, a sample of students at the nearest college is a simple random sample, so the results should be representative of the population of adults.

Find the mean for the list of numbers. Ages of patients (in years ) in a clinic: 15, 4, 22, 15 Round answer to the nearest whole number if necessary.

Solve 3 and 4

Help

Use the stem-and-leaf plot below to determine the five number summary for the data. Stem Leaves 10 1 2 22357 356 0146

50 part-time students were asked how many courses they were taking this term. The (incomplete) results are shown below: # of Courses Frequency Relative Frequency Cumulative Frequency 1 24 0.48   2 15     3       a.  Complete the table.b.  What percent of students take exactly one course? %

The frequency which is calculated dividing the frequency by the cumulative frequency and multiplied by 100 is a. Class width b. Range c. Relative frequency d. Mid- Poirt

Find the following for the data shown: 6 29 65 96 28 30 66 95 What is the percentile of the data value 66? Round to the nearest whole number. Which data value represents the 20th percentile?